JP6637826B2 - On-board communication device - Google Patents

Description

  The present invention relates to a transponder on-board device that controls a vehicle by transmitting and receiving electronic message information to and from a ground communication device installed on the ground.

  The transponder on-board device mounted on the vehicle transmits and receives electronic message information to and from a ground communication device installed on the road. Here, data such as the speed limit and position information of the vehicle obtained from the ground device are used for important control of vehicle operation such as vehicle speed control. Here, the terrestrial communication device includes a powered terrestrial communication device that is supplied with power from the terrestrial device, and a non-powered terrestrial communication device that receives power from a transponder on-board device and starts up. Both terrestrial communication devices transmit message information having a frequency different from the power wave to the on-board device. Here, since communication with the ground communication device may be related to safety in vehicle operation as described above, it is required to reliably communicate with the ground communication device.

  Here, in order to activate the non-powered ground communication device and reliably communicate with the ground communication device, it is necessary to transmit stable power from the transponder on-board device to the ground communication device. Therefore, the power wave output transmitted from the transponder on-board device may be out of the specified value. Therefore, a function for monitoring that the transmission power of the transponder on-board device is a rated value and a function for adjusting the transmission output level may be provided.

  Patent Documents 1 and 2 disclose on-vehicle transmission / reception devices that monitor transmission power and switch the output. Patent Document 1 states that “the power wave transmission level / frequency monitoring circuit 27 monitors the transmission level and frequency of the power wave to be transmitted. The resonance circuit switching control circuit 28 is provided in the power wave transmission unit 30 of the vehicle body 15. The switching control of the resonance circuit having the frequency f1 and the resonance circuit having the frequency f2 is performed. "

  Patent Document 2 states that "the power control circuit 190 enters a normal operation mode loop used to reach an appropriate steady-state gain. In step 208, the output power is reduced by the comparator 1888. , And if it is low, adjust the gain by increasing the gain in gain steps. "

JP 2003-237580 Special table 2005-501438

  In general, a transponder on-board device includes a power wave transmitting unit, an information wave transmitting / receiving unit, and a vehicle (antenna) for transmitting and receiving a power wave and an information wave. Here, as a conventional method of controlling the constant output of the power wave output, a power wave transmission level monitor unit that monitors a power wave transmission level transmitted to the vehicle body is provided, and the power wave is obtained based on the transmission power value acquired by the monitor unit. There is feedback control for adjusting the transmission set value.

  However, in the conventional method, the monitor value of the power wave transmission power is temporarily changed by the influence of the magnetic field coupling between the vehicle arm and the antenna in the ground communication device while the vehicle arm passes over the ground communication device. When a decrease is indicated, feedback control is performed so as to increase the transmission power of the power wave accordingly. However, when the vehicle arm passes over the terrestrial communication device, an overcurrent starts to flow, and the output becomes unstable by repeatedly increasing and decreasing the power transmission power. There has been a concern that an excess or a decrease in transmission power is detected, and a failure due to overpower occurs.

In order to solve the above-described problem, one of the typical on-vehicle communication devices of the present invention includes a power wave output control unit that outputs a power wave amplitude set value that sets the amplitude of a power wave, and a power wave amplitude setting unit that is set at the time of startup. A feedback control unit that receives and stores the value, and outputs a power wave signal instructing the output of the power wave whose amplitude is the power wave amplitude setting value, and receives the power wave signal and corresponds to the amplitude of the power wave amplitude setting value. A power wave amplification unit that generates a power wave power that is the power of the power wave,
A power wave monitor that measures the power wave power and outputs the amplitude as a power wave detection amplitude value; a power wave transmission antenna that receives the power wave power and spatially radiates the power wave; and information transmitted from a terrestrial communication device. An information wave receiving antenna that receives a wave and outputs an information wave power; an information wave demodulator that receives and demodulates the information wave power and outputs an information wave signal; and receives an information wave signal and determines the presence or absence of an information wave. In an onboard communication device including an information wave detection unit that outputs information wave detection information indicating the presence or absence of an information wave, the feedback control unit receives a power wave detection amplitude value from a power wave monitor, and receives information from the information wave detection unit. Receives the wave detection information, recognizes the presence or absence of the information wave, and when it recognizes that there is no information wave, stores the stored power to output a power wave signal that sets the amplitude of the power wave to a value within a specified range. Wave This is achieved by having the function of adjusting the width set value.

  ADVANTAGE OF THE INVENTION According to this invention, when an antenna impedance changes at the time of passing a terrestrial communication apparatus, it is possible to suppress the excessive output or the underpower of the power wave output by the response delay of the feedback control immediately after passing a terrestrial communication apparatus.

FIG. 2 is a configuration diagram of the communication device according to the first embodiment. FIG. 3 is a diagram illustrating a control flow of the communication device according to the first embodiment. 5 is an example of a timing chart of power wave output control in the communication device according to the first embodiment. FIG. 2 is a configuration diagram of a communication device according to a conventional technique. FIG. 13 is a diagram illustrating a control flow of the communication device according to the second embodiment. FIG. 14 is a diagram illustrating a control flow of the communication device according to the third embodiment. 13 is a timing chart example of power wave output control in the communication device according to the third embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The first embodiment will be described with reference to FIGS.

  First, FIG. 4 shows a configuration example of a communication device according to the related art. Upon receiving the power wave output instruction from the transmission / reception unit control device 1-13, the power wave output control unit 1-1 sets the output amplitude and frequency of the power wave, and outputs a signal to the power wave amplification unit 1-2. The power wave amplifier 1-2 amplifies the signal and supplies power to the terrestrial communication device 1-6 via the power wave transmitting antenna 1-3. The power wave monitor 1-4 monitors an output current flowing between the power wave amplifying unit 1-2 and the power wave transmitting antenna 1-3, and monitors a monitor value determination unit 1-5 and a power wave output control unit 1-1. Output to The monitor value judging unit 1-5 judges whether the output value of the power wave monitor 1-4 exceeds or falls below a specified range, and transmits and receives the result via the power wave output control unit 1-1. Send to department control device 1-13. Here, when the transmission power is out of the specified range, the transmission / reception unit control device 1-13 sends a command to the power wave output control unit 1-1 to stop the power wave transmission. Further, the power wave output control unit 1-1 directly receiving the output value of the power wave monitor 1-4 changes the amplitude setting value so that the monitor value approaches the expected value of the power wave.

  On the other hand, the information wave sent from the terrestrial communication device 1-6 to the upper armature is input to the information wave demodulation unit 1-8 that performs demodulation processing via the information wave reception antenna 1-7, and is transmitted to the information wave demodulation unit. Demodulated by 1-8. The demodulated signal is sent to the information wave detection unit 1-9, and when it is determined that there is information wave data, the data is transmitted to the transmission / reception unit control device 1-13 via the information wave control unit 1-10. Sent and used for vehicle control.

  Also, when transmitting information data from the on-board device to the ground communication device 1-6, the information wave control unit 1-10 to the information wave modulation unit 1-11 by the information wave transmission instruction from the transmission and reception unit control device 1-13 An information wave transmission signal is output. The information wave modulator 1-11 modulates the received data and wirelessly transmits the data to the terrestrial communication device 1-6 via the information wave transmission antenna 1-12.

  However, as described above, in the conventional configuration, there is a concern that the power wave transmission power is not stabilized because the vehicle arm repeatedly increases and decreases the power wave transmission power when passing through the ground communication device.

  The on-vehicle communication device according to the present embodiment has a configuration in which the feedback of the power wave output is stopped while the on-vehicle child is passing over the terrestrial communication device, thereby suppressing the repetition of increase and decrease of the transmission power.

  The functions of the devices constituting this embodiment will be described with reference to FIGS.

  The present invention includes a feedback control unit 1-14 incorporating the function of the monitor value determination unit 1-5, in addition to the conventional configuration as shown in FIG. The feedback control unit 1-14 receives and stores the amplitude setting value and the frequency setting value of the power wave output from the power wave output control unit 1-1. Feedback control section 1-14 outputs a signal having an amplitude set value and a frequency set value to power wave amplification section 1-2.

  Further, the feedback control unit 1-14 also receives the output value of the power wave monitor 1-4, and changes the amplitude setting value so that the monitor value approaches the expected power wave amplitude, and has the amplitude. The signal is output to the power wave amplifier 1-2. Here, note that the information wave detection unit 1-9 detects information data while the vehicle arm is passing over the terrestrial communication device, and the feedback control from the information wave detection unit 1-9 is performed while the information data is being received. The data detection signal is output to the unit 1-14. The feedback control unit 1-14 stops updating the amplitude set value while receiving the data detection signal from the information wave detection unit 1-9. In other words, the amplitude setting value remains at the value before passing through the ground child.

  After the vehicle arm passes over the ground communication device, the information wave information detector 1-9 stops outputting the information data detection signal to the feedback controller 1-14 because the information wave reception from the ground arm is lost. Then, the feedback control unit 1-14 restarts updating the held amplitude setting value. As described above, since the output value of the power wave monitor 1-4 and the amplitude set value in the feedback control unit 1-14 become almost equal before and after passing through the ground antenna, the transmission power does not repeatedly increase or decrease, and is stable. Power wave transmission.

  Here, the power wave monitor 1-4 can be realized by, for example, converting a current into a voltage using a current transformer and detecting the voltage with an arithmetic unit such as a CPU.

  Further, the feedback control unit 1-14 has, for example, an upper threshold value that defines the upper limit value of the target, and a lower threshold value that defines the lower limit value of the target, and compares the monitored value obtained by the power wave monitor 1-4 with feedback. Used for control. If the time during which the monitor value exceeds the maximum rating (excess detection threshold) continues for a certain period of time, an excess detection signal is output to the power wave output control unit 1-1, and the monitor value becomes the minimum rating (lower detection threshold). If the time is less than the predetermined time, a lowering detection signal is output to the power wave output controller 1-1.

  Here, the upper threshold is 110% of the rated output value, and the lower threshold is 90% of the rated output value. However, an appropriate value may be arbitrarily set.

  When receiving the excess detection signal or the decrease detection signal, the power wave output control unit 1-1 stops the output as an abnormal power wave output.

  Next, a feedback control flow of the power wave output when the present invention is applied will be described.

  FIG. 2 shows an operation sequence of the present embodiment.

  In step 2-1, the power wave output control unit 1-1 stores the stored power wave amplitude rated output set value according to the power wave output instruction from the transmission / reception unit control device 1-13. The rated output set value of the frequency of the power wave is input to the feedback control unit 1-14, and the start of the output of the power wave is instructed to the feedback control unit 1-14.

  In step 2-2, the feedback control unit 1-14 receives the instruction to start the output of the power wave from the power wave output control unit 1-1, and sets the rated output set value of the amplitude of the power wave to the initial value of the amplitude set value. The value and the frequency of the power wave are set, and the process proceeds to step 2-3.

  In step 2-3, the feedback control unit 1-14 updates the amplitude setting value, if any, and sets the amplitude of the signal input to the power wave amplification unit 1-2 to the amplitude setting value, and The frequency of the signal input to the section 1-2 is set to the frequency set value and output. After that, the processing makes a transition to Step 2-4.

  In step 2-4, feedback control section 1-14 determines whether or not the information wave signal from ground communication apparatus 1-6 is being received, based on the output signal of information wave detection section 1-9. If it is determined that the information wave signal has been received, step 2-4 is repeated to temporarily stop the feedback control, and the power wave output level is maintained. If it is determined that the information wave signal has not been received, the process proceeds to step 2-5.

  In step 2-5, feedback control section 1-14 acquires a monitor value from power wave monitor 1-4, and transitions to step 2-6.

  In step 2-6, the feedback control unit 1-14 smoothes the monitor value using a filter in order to prevent the acquired monitor value from fluctuating instantaneously. Let X be the smoothed monitor value. After that, the processing makes a transition to Step 2-7.

  In step 2-7, when the state where the monitor value X is larger than the excess detection threshold A continues for T seconds, the feedback control unit 1-14 transitions to step 2-13. If the monitor value X is equal to or less than the excess detection threshold A, the process proceeds to step 2-8.

  In step 2-8, the feedback control unit 1-14 transitions to step 2-14 when the state where the monitor value X is smaller than the drop detection threshold B continues for T seconds. If the monitor value X is equal to or greater than the drop detection threshold B, it is determined that there is no output abnormality, and the flow shifts to step 2-9.

  In step 2-9, when the monitor value X is larger than the upper limit threshold a, which is the target upper limit, the feedback controller 1-14 transitions to step 2-11. If the monitor value X is equal to or less than the upper limit threshold a, which is the target upper limit, the process proceeds to step 2-10.

  In step 2-10, if the monitor value X is smaller than the lower limit threshold b, which is the target lower limit, the feedback controller 1-14 transitions to step 2-12. If the monitor value X is equal to or larger than the lower limit threshold b, which is the target lower limit, the process proceeds to step 2-3.

  In step 2-11, the constant control amount Y is subtracted from the amplitude set value to update the value, and the process proceeds to step 2-3. The constant control amount Y is 2% of the rated output set value of the power wave amplitude, but may be set arbitrarily.

  In step 2-12, the constant control amount Y is added to the amplitude set value to update the value, and the process proceeds to step 2-3.

  In step 2-13, feedback control section 1-14 notifies power wave output control section 1-1 of the power wave output abnormality. The power wave output control unit 1-1 instructs the feedback control unit 1-14 to stop the output of the power wave, and the feedback control unit 1-14 notified of this instructs the signal to the power wave amplification unit 1-2. Stop typing.

  In step 2-14, feedback control section 1-14 notifies power wave output control section 1-1 of the power wave output abnormality. The power wave output control unit 1-1 instructs the feedback control unit 1-14 to stop the output of the power wave, and the feedback control unit 1-14 notified of this instructs the signal to the power wave amplification unit 1-2. Stop typing.

  FIG. 3 shows a time chart of the above embodiment.

  According to this embodiment, when the antenna impedance changes gently like a temperature change and the power wave output increases or decreases, or the power wave output increases or decreases due to the characteristic deterioration of the device components due to long-term operation (for example, electric equipment of a train). Even in this case, it is possible to stably supply power to the terrestrial communication device.

  The second embodiment will be described with reference to FIG.

  In the second embodiment, the function of adjusting the amplitude set value is added to the configuration of the first embodiment when a ground signal (information wave) is received, and after a certain period of time, it is recognized that there is no ground signal (information wave). Is different. Therefore, the feedback control unit 1-14 has a timer inside.

  Steps 2-1 and 2-2 are the same as in the first embodiment.

In step 2-3, the feedback control unit 1-14 updates the amplitude setting value, if any, and sets the amplitude of the signal input to the power wave amplification unit 1-2 to the amplitude setting value, and The frequency of the signal input to the section 1-2 is set to the frequency set value and output. After that, the processing makes a transition to Step 2-16.
In step 2-16, the feedback control unit 1-14 checks the internal timer. If the timer is not operating or a certain time has elapsed since the timer was set, the process proceeds to step 2-4. If the timer is running and the fixed time has not elapsed since the timer was set, steps 2-16 are repeated. This fixed time is 1 μs, but may be set arbitrarily.

In step 2-4, feedback control section 1-14 determines whether or not an information wave signal is being received from terrestrial communication apparatus 1-6, based on the output signal of information wave detection section 1-9. If it is determined that the information wave signal has been received, the process proceeds to step 2-15. If it is determined that the information wave signal has not been received, the process proceeds to step 2-5.
In step 2-15, the feedback control unit 1-14 checks the internal timer, and if it is operating, resets and stops the operation. Thereafter, the internal timer is activated, and the process proceeds to step 2-3.

  Steps 2-5 to 2-14 are the same as in the first embodiment.

  According to the present embodiment, when the information wave signal from the terrestrial communication device 1-6 changes near the threshold of the determination of the information wave detection unit 1-9, the feedback control unit 1-14 changes the amplitude setting value in a short cycle. It is possible to suppress the phenomenon of changing.

  Embodiment 3 will be described with reference to FIG.

  The third embodiment is different from the first embodiment in that the ground signal (information wave) is recognized after receiving the ground signal (information wave), and that the ground signal (information wave) is not detected within a predetermined time after that. The difference is that a function of adjusting the amplitude set value is added to the above. Therefore, the feedback control unit 1-14 internally has a terrestrial wave detection flag and a terrestrial wave re-detection flag. These flags are initialized (cleared) in step 2-2.

  Steps 2-1 and 2-3 are the same as those in the first embodiment.

  Step 2-2 is the same as that of the first embodiment except that the feedback control unit 1-14 initializes (clears) the terrestrial wave detection flag and the terrestrial wave re-detection flag.

  In step 2-4, feedback control section 1-14 determines whether or not the information wave signal from ground communication apparatus 1-6 is being received, based on the output signal of information wave detection section 1-9. If it is determined that the information wave signal has been received, the process proceeds to step 2-17. If it is determined that the information wave signal has not been received, the process proceeds to step 2-18.

  In step 2-17, feedback control section 1-14 sets a terrestrial wave detection flag. After that, the processing makes a transition to Step 2-4.

  At step 2-18, feedback control section 1-14 checks whether the terrestrial wave detection flag is set. If it is set, the flow goes to step 2-19. If it is not set, the flow goes to step 2-5.

  In step 2-19, the feedback control unit 1-14 determines whether or not the information wave signal from the terrestrial communication device 1-6 has been received based on the output signal of the information wave detection unit 1-9 for a predetermined time. stand by. This determination is made by setting a terrestrial wave redetection flag when an information wave signal is received during a certain period of time during standby. After that, the processing makes a transition to Step 2-20. This fixed time is 1 μs, but may be set arbitrarily.

  In step 2-20, feedback control section 1-14 confirms whether or not an information wave signal has been received from ground communication apparatus 1-6 in step 2-19. This confirmation is made based on whether the terrestrial wave redetection flag is set. When the information wave signal is received, that is, when the terrestrial wave redetection flag is set, the terrestrial wave redetection flag is cleared, and the process proceeds to step 2-4. When the information wave signal has not been received, that is, when the terrestrial wave redetection flag has not been set, the terrestrial wave detection flag is cleared and the process proceeds to step 2-5.

  Steps 2-5 to 2-14 are the same as in the first embodiment.

  FIG. 7 shows a time chart of the above embodiment.

  According to the present embodiment, when the information wave signal from the terrestrial communication device 1-6 changes near the threshold of the determination of the information wave detection unit 1-9, the feedback control unit 1-14 changes the amplitude setting value in a short cycle. It is possible to suppress the phenomenon of changing.

  Note that the present invention is not limited to the above-described embodiment, and includes various modifications. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described above. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of one embodiment can be added to the configuration of another embodiment. Further, for a part of the configuration of each embodiment, it is possible to add, delete, or replace another configuration.

1-1 Power wave output controller
1-2 Power wave amplifier
1-3 Power wave transmitting antenna
1-4 Power Wave Monitor
1-5 Monitor value judgment section
1-6 Ground Communication Equipment
1-7 Information wave receiving antenna
1-8 Information wave demodulator
1-9 Information wave detector
1-10 Information wave controller
1-11 Information wave modulator
1-12 Information Wave Transmitting Antenna
1-13 Transmitter / receiver controller

2-1 Power wave output start block
2-2 Initial value setting block of feedback control unit
2-3 Update block for amplitude setting value of feedback control unit
2-4 Ground signal reception confirmation block
2-5 Feedback control unit monitor value acquisition block
2-6 Acquisition monitor value filter processing block
2-7 Power wave output excess detection judgment block
2-8 Power wave output drop detection judgment block
2-9 Power Wave Output Level Reduction Comparison Block
2-10 Power wave output level increase comparison block
2-11 Indicated value reduction block
2-12 Indicated value increase block
2-13 Excess detection block
2-14 Lowering detection block
2-15 Timer set block
2-16 Elapsed time detection block
2-17 Ground wave detection flag set block
2-18 Ground wave detection flag confirmation block
2-19 Block for a certain period of time
2-20 Ground signal reception confirmation block

Claims (7)

A power wave output control unit (1-1) for outputting a power wave amplitude set value for setting the amplitude of the power wave;
A feedback control unit (1-14) that receives and stores the power wave amplitude set value at startup and outputs a power wave signal that instructs output of the power wave whose amplitude is the power wave amplitude set value;
A power wave amplifier (1-2) that receives the power wave signal and generates a power wave power that is the power of the power wave corresponding to the power wave amplitude set value;
A power wave monitor (1-4) that measures the power wave power and outputs the amplitude as a power wave detection amplitude value;
A power wave transmitting antenna (1-3) that receives the power wave power and spatially radiates the power wave power;
An information wave receiving antenna (1-7) for receiving an information wave transmitted from the terrestrial communication device (1-6) and outputting an information wave power;
An information wave demodulator (1-8) for receiving and demodulating the information wave power and outputting an information wave signal;
An on-board communication device including an information wave detection unit (1-9) that receives the information wave signal, determines the presence or absence of the information wave, and outputs information wave detection information indicating the presence or absence of the information wave,
The feedback control unit (1-14) receives the power wave detection amplitude value from the power wave monitor (1-4), receives the information wave detection information from the information wave detection unit (1-9), and Recognizing the presence or absence of an information wave, when recognizing the absence of the information wave, adjusting the power wave amplitude set value to output the power wave signal to make the amplitude of the power wave a value within a specified range. An on-vehicle communication device characterized by having a function of performing on-board communication. The on-vehicle communication device according to claim 1,
The on-vehicle communication device, wherein the feedback control unit (1-14) has a function of stopping adjustment of the power wave amplitude set value of the power wave signal when recognizing that the information wave is present. The onboard communication device according to any one of claims 1 and 2,
The feedback control unit (1-14) has an upper threshold, a lower threshold, and an adjustment value,
If the power wave detection amplitude value is greater than the upper threshold, subtract the power wave amplitude set value by the adjustment value,
An on-vehicle communication device having a function of adding the adjustment value to the power wave amplitude setting value when the power wave detection amplitude value is smaller than the lower limit threshold value. The on-vehicle communication device according to any one of claims 1 to 3,
The feedback control unit (1-14) has an excess detection threshold and a decrease detection threshold,
When the state where the power wave detection amplitude value is larger than the excess detection threshold has continued for a certain period of time , or when the state where the power wave detection amplitude value is smaller than the decrease detection threshold has continued for a certain period of time, the output of the power wave signal An on-vehicle communication device having a function of stopping the vehicle. The on-vehicle communication device according to any one of claims 1 to 4,
The feedback control unit (1-14) has an excess detection threshold and a decrease detection threshold,
When the state where the power wave detection amplitude value is larger than the excess detection threshold has continued for a certain period of time , or when the state where the power wave detection amplitude value is smaller than the decrease detection threshold has continued for a certain period of time, the power wave output control unit (1-1) An on-vehicle communication device having a function of notifying a power wave output abnormality . The on-vehicle communication device according to any one of claims 1 to 5, wherein the feedback control unit (1-14) recognizes the presence of the information wave, and after a lapse of a predetermined time, transmits the information wave. An on-vehicle communication device having a function of adjusting the power wave amplitude set value when it is recognized that there is no power wave amplitude . The on-vehicle communication device according to any one of claims 1 to 5 , wherein the feedback control unit (1-14) recognizes that there is no information wave after recognizing that the information wave exists. ,
An on-vehicle communication device having a function of adjusting the power wave amplitude set value when the presence of the information wave is not recognized for a predetermined time thereafter.

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